Catechism of Agricultural Chemistry and GeologyW. Blackwood, 1844 - 48 páginas |
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Página 6
... bones in which phosphoric acid is present . By placing these substances , or the bottles containing them , before the eyes of the pupils occasionally , they will soon become familiar with their names and with their several qualities . Q ...
... bones in which phosphoric acid is present . By placing these substances , or the bottles containing them , before the eyes of the pupils occasionally , they will soon become familiar with their names and with their several qualities . Q ...
Página 8
... acid ? A. Phosphoric acid is also a very sour substance , which is made by burning phosphorus in the air . It exists in large quantity in the bones of animals . Fig . 7 . If the teacher possess any phosphorus 8 CATECHISM OF AGRICULTURAL.
... acid ? A. Phosphoric acid is also a very sour substance , which is made by burning phosphorus in the air . It exists in large quantity in the bones of animals . Fig . 7 . If the teacher possess any phosphorus 8 CATECHISM OF AGRICULTURAL.
Página 32
... bones employed as a ma- nure ? A. Bones are crushed in mills , and then sifted into the various sizes of inch bones , half - inch bones , and dust . Q. In which of these forms do they act most quickly ? A. They act most quickly in the ...
... bones employed as a ma- nure ? A. Bones are crushed in mills , and then sifted into the various sizes of inch bones , half - inch bones , and dust . Q. In which of these forms do they act most quickly ? A. They act most quickly in the ...
Página 33
... bones have produced re- markable benefits . Q. What do bones consist of ? A. Bones consist of glue or gelatine , which may be partly extracted by boiling them in water , and partly of bone - earth , which remains behind when bones are ...
... bones have produced re- markable benefits . Q. What do bones consist of ? A. Bones consist of glue or gelatine , which may be partly extracted by boiling them in water , and partly of bone - earth , which remains behind when bones are ...
Página 34
... bone - earth . Q. And what effect follows from adding the bones ? A. The bones supply the bone - earth of which the land had been robbed . New grasses then spring up which contain much bone - earth , and which , when eaten by the cow ...
... bone - earth . Q. And what effect follows from adding the bones ? A. The bones supply the bone - earth of which the land had been robbed . New grasses then spring up which contain much bone - earth , and which , when eaten by the cow ...
Palavras e frases frequentes
AGRICULTURAL CHEMISTRY ammonia animal require applied bone-earth bones burns called carbon and water carbonic acid gas CHEMISTRY AND GEOLOGY Chlorine clover common salt compost consist of carbon contain cow-dung crops cwts draining dung earth EDINBURGH employed fall to powder farm-yard manure farmer fattening fermentation fertile give gluten grass lands grow guano gypsum hydrogen inorganic kind of air large quantity leaves LECTURES ON AGRICULTURAL light lands lighted taper limestone liquid magnesia marl mixed nitrogen oats obtain oil of vitriol organic food organic matter oxide of iron oxygen gas phosphate of lime phosphoric acid plants require potash potatoes produced profit proportion pupils quicklime roots sea-weed shell sand Silica slaked smell soda soil consists sour starch straw subsoil substances sulphuric acid supply taste teacher may exhibit teacher may illustrate teacher will show turnip usually vegetable waste wheat white fumes wood woody fibre
Passagens conhecidas
Página 17 - Q. Whence is the organic part of the soil derived? A. It is derived from the roots and stems of decayed plants, and from the dung and remains of animals and insects of various kinds. Q. Does this organic part form a large proportion of the soil ? A. Of peaty soils it forms sometimes three-fourths of the whole weight; but of rich and fertile soils it does not usually form more than from a twentieth to a tenth of the whole weight. Q. Can a soil bear good crops which does not contain a considerable...